[논문]PVC-THF 용액에 비용매 첨가에 따른 PVC 박막의 표면 특성 분석

이승규; 문제철; 이원규

doi:10.14478/ace.2022.1033

PVC-THF 용액에 비용매 첨가에 따른 PVC 박막의 표면 특성 분석
Analysis of Surface Properties of PVC Thin Film according to Addition of Non-solvent to PVC-THF Solution 원문보기

공업화학 = Applied chemistry for engineering, v.33 no.4, 2022년, pp.367 - 372

이승규 (강원대학교 화공.생물공학부) , 문제철 (강원대학교 화공.생물공학부) , 이원규 (강원대학교 화공.생물공학부)

초록
AI-Helper

폴리염화비닐(polyvinylchloride, PVC)-tetrahydrofuran (THF) 용액에 PVC 비용매의 첨가와 박막 건조 공정이 PVC 박막에 미치는 영향을 분석하였다. 사용된 비용매는 알코올과 비알코올계로 구성되었으며, 첨가에 따른 PVC 박막의 표면 거칠기와 표면 형상의 차별성에 따른 소수성 성질을 비교하였다. PVC-THF 용액 제조과정에 발생하는 용액 내 기포 함유가 박막의 표면 구조에 미치는 영향이 큼을 확인하였다. 상대적인 고농도 PVC-THF 용액에서 코팅 박막의 정상적 표면 물성을 구현하기 위하여 적절한 박막 건조법의 선택이 요구된다. 알코올계 비용매를 첨가할 경우 과립형 형상의 다공성 표면을 갖는 PVC 박막이 얻어져 초소수성 특성을 보인다. 비용매에 대한 PVC-THF 용액의 부피 비는 코팅 박막의 표면 형상에 영향을 주며, 비용매 첨가량이 많을수록 초소수성 PVC 박막을 형성하는 데 유리하다.

Abstract ▼ AI-Helper

The effect of the addition of a polyvinylchloride (PVC) non-solvent to a PVC-tetrahydrofuran (THF) solution on the surface properties of the PVC thin film was analyzed. The non-solvents used were composed of alcohol-based and non-alcoholic ones. Surface morphologies of PVC thin films according to the addition of the non-solvent were compared. In addition, the hydrophobic properties relying on the surface characteristics were compared. The micro-bubbles generated in the preparation of PVC-THF solution affected the surface morphology of the thin film. In order to implement the normal surface physical properties of the coating thin film at the relatively high concentration of PVC-THF solution, the selection of appropriate drying method was required. When an alcohol-based non-solvent was added, a PVC thin film having a granular porous surface was obtained and exhibited super hydrophobic properties. The volume ratio of the PVC-THF solution to the non-solvent affects the surface shape of the coating thin film. The larger the amount of non-solvent was added, the more advantageous it was to form a super hydrophobic PVC thin film.

주제어

표/그림 (7)

그림 Figure 1. Contact angles of PVC thin films prepared from PVC-THF solutions with different wt% of PVC. All PVC films formed by dip coating and dried at room temperature and pressure.
그림 Figure 2. Comparison of surface morphology of PVC thin films prepared from PVC-THF solutions with different wt% of PVC. All PVC films formed by dip coating and dried at room temperature and pressure.
그림 Figure 3. Contact angle of PVC thin film formed by dip coating on slide glass using 10 wt% PVC-THF solution. PVC films were dried in vacuum oven during 30 to 120 min in 300 mTorr at room temperature.
그림 Figure 4. Contact angle of PVC thin film formed by dip coating on slide glass using 10 wt% PVC-THF solution. PVC films were dried in convection oven for 30 min with different temperature from 50 to 150 °C.
그림 Figure 5. Comparison of surface morphology of PVC thin films prepared with nonsolvent-added 10 wt% PVC-THF solution (volume ratio between nonsolvent and PVC-THF solution = 1).
표 Table 1. Comparison of contact angles of PVC thin films prepared with non-solvent-added 10 wt% PVC-THF solution (volume ratio between non-solvent and solution = 1).
그림 Figure 6. Contact angle of PVC thin films formed by changing the volume ratio of alcohol-based nonsolvent(methanol, ethanol, isopropanol and n-propanol) and 10wt% PVC-THF solution from 1:1 to 1:9. PVC thin films formed on slide glass by dip coating and dreid by vacuum oven at 300 mTorr and room temperature for 2 hours.

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